Procs

func borrowingSub[T: SomeSignedInt](a, b: T; borrowIn: bool): (T, bool) {.
    inline, noinit.}

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func borrowingSub[T: SomeUnsignedInt](a, b: T; borrowIn: bool): (T, bool) {.
    inline, noinit.}

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func carryingAdd[T: SomeSignedInt](a, b: T; carryIn: bool): (T, bool) {.inline,
    noinit.}

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func carryingAdd[T: SomeUnsignedInt](a, b: T; carryIn: bool): (T, bool) {.
    inline, noinit.}

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func mulAcc[T: uint64 | uint32](t, u, v: T; a, b: T): (T, T, T) {.inline, noinit.}

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func mulDoubleAdd2[T: uint64 | uint32](a, b, c, dHi, dLo: T): (T, T, T) {.
    inline, noinit.}

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func narrowingDiv(uHi, uLo, v: uint64): (uint64, uint64) {.inline, noinit,
    ...raises: [], tags: [], forbids: [].}

Knuth's Algorithm D (Division of nonnegative integers) implementation. Source   Edit  

func overflowingAdd[T: SomeSignedInt](a, b: T): (T, bool) {.inline, noinit.}

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func overflowingAdd[T: SomeUnsignedInt](a, b: T): (T, bool) {.inline, noinit.}

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func overflowingSub[T: SomeSignedInt](a, b: T): (T, bool) {.inline, noinit.}

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func overflowingSub[T: SomeUnsignedInt](a, b: T): (T, bool) {.inline, noinit.}

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func saturatingAdd[T: SomeSignedInt](a, b: T): T {.inline, noinit.}

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func saturatingAdd[T: SomeUnsignedInt](a, b: T): T {.inline, noinit.}

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func saturatingSub[T: SomeSignedInt](a, b: T): T {.inline, noinit.}

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func saturatingSub[T: SomeUnsignedInt](a, b: T): T {.inline, noinit.}

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func wideningMul(a, b: int32): (int32, uint32) {.inline, noinit, ...raises: [],
    tags: [], forbids: [].}

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func wideningMul(a, b: int64): (int64, uint64) {.inline, noinit, ...raises: [],
    tags: [], forbids: [].}

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func wideningMul(a, b: uint32): (uint32, uint32) {.inline, noinit, ...raises: [],
    tags: [], forbids: [].}

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func wideningMul(a, b: uint64): (uint64, uint64) {.inline, noinit, ...raises: [],
    tags: [], forbids: [].}

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func wideningMulAdd(a, b, c, d: uint64): (uint64, uint64) {.inline, noinit,
    ...raises: [], tags: [], forbids: [].}

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func wideningMulAdd(a, b, c: uint64): (uint64, uint64) {.inline, noinit,
    ...raises: [], tags: [], forbids: [].}

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